The best tool you can probably have on hand is a glue gun. They come in handy for everything. My girlfriend used a hot glue gun to put the bolts into the base. The glue not only filled in the empty space in the hole but definitely secured the bolts tightly.
In case I haven't mentioned, the candle holders are 9 3/8" bolts. There are eight 3" bolts and one 4" bolt that goes in the center. Each one is then capped with a 3/8" hex nut that is threaded on and then glued in place. She glued the 9 bolts in place and then the hex nuts.
That's pretty much it! If you follow these instructions you'll have a complete menorah in no time. I think the entire project took less than an hour.